[Feature] Abstract key interface for symmetric encryption

[Damian-Nordic]

Feature description

The interface for symmetric encryption (AES CCM and CTR) should not assume that the application has direct access to the encryption key. The key reference should be abstracted so that it is possible to store the keys securely, that is, in isolation from the application code.

Platform

all

Platform Version(s)

No response

Anything else?

No response